Theoretically Cid change should give only more torque. Torque is basically one powerstroke and hp is all the powerstroke added up, why I say basically because torque has no movement but it's a good way to see it. Static displacement aka 340 440 540 etc.. But a running engine has dynamic displacement Cid x rpm / 3456 = cfm, is how much air your engine can displace per minute. Bore heads cam etc... Aka air flow is what gives power if you don't change them larger displacements should trade rpm for torque basically evening out, same hp. Now obviously there's other factors involved since were generally talking generic parts head ports cam timings etc.. They may and probably will favor one application over the other.
